Gupta, K. K., Roy, B., Chaudhary, S. C., Mishra, A., Patel, M. L., Singh, J., & Kumar, V. (2018). Prevalence of pulmonary artery hypertension in patients of chronic obstructive pulmonary disease and its correlation with stages of chronic obstructive pulmonary disease, exercising capacity, and quality of life. J Family Med Prim Care.

Gupta, Kamlesh Kumar, Bidyut Roy, Shyam Chand Chaudhary, Arvind Mishra, M. L. Patel, Jitendra Singh, a Vivek Kumar. "Prevalence of Pulmonary Artery Hypertension in Patients of Chronic Obstructive Pulmonary Disease and Its Correlation With Stages of Chronic Obstructive Pulmonary Disease, Exercising Capacity, and Quality of Life." J Family Med Prim Care 2018.

Gupta, Kamlesh Kumar, et al. "Prevalence of Pulmonary Artery Hypertension in Patients of Chronic Obstructive Pulmonary Disease and Its Correlation With Stages of Chronic Obstructive Pulmonary Disease, Exercising Capacity, and Quality of Life." J Family Med Prim Care 2018.